Blindstitch sewing-machine.



J. GOLDBERG.

auunsm cu SEWING MACHINE,

- APPLICATION EILED SEPT. 1. I914 mw Patented June 20; 1916.

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.I. GOLDBERG. v

- BLINDSTITCH' SEWING MACHINE.

APPLICATION HL ED SEP-T. 1, 1914.

L1 WWW Patented June 20,1916.

2 SHEETSSHEET 2.

chines therefor, or the performance of the 'iieces'sary work by hand labor.

moon eornnnne, or CINCINNATI, OHIO.

BLINDSTITCH SEWING-MACHINE.

' Specification of Letters Patent.

Patented June 2&191'16.

Application filed September 1, 191%. Serial No. 859,711.

To all whom it may concern:

Be it known that I, JACOB GOLDBERG, a

citizen of the United States, and a resident of Cincinnati, county of Hamilton, and State of Ohio, have invented a new and useful Improvement in Blindstitch Sewing-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification. My invention relates to blind stitch sewing machines of the kind used for the padding of collars and lapels and the felling of the bottoms of pants and similar work, and particularly to that type of blind stitching machines employing a single thread.

In the single thread. blind stitching machines heretofore .in use certain imperfections, particularly in the arrangement of the feed mechanism, the needle guide and the adjustment of the work in the machine,

have resulted insuch delays in operation, breakage of needles and general inadequacy of performance, as to lead very 'generally to the. entire discarding of the machines and th a substitution of other, double thread, ma-

The purpose of my invention relates to providing a machine in which these evils are remedied, and particularly to the provision of cooperating parts adapted to be substituted for corresponding parts of the old machines heretofore in use, whereby said machines may be reconstructed, orrebuilt, and thus adapted for efficient and economic performance.

With this purpose in View, the several objects of my invention are, first: to provide operating mechanism for the upper and lower feeds of such a machine, of such construction that sufiicient space will be left in the machine for the passage of the material during operation; second: to provide a table, or plate, which will prevent the material operated upon. from becoming clogged therein; third: to provide a suitable needle guide; and, fourth: an adjustable bridge by means of which the material operated upon may be adjusted so that the penetration of the needle will be to the proper depth for the purpose of blind stitching.

Further objects of my invention will appear from the following description thereof.

In the drawings: Figure 1 is a top view of a 'njrachine constructed. in accordance with my invention; Fig. 2 is a side eleva-- tion of the same; Fig. 3 is a top View of the base and frame of a single thread blind stitching machine of the design heretofore in use; Fig. 4 is a top view of the apron and a port on of the feed mechanism of my new machlne; Fig. 5 is a side view of a portion of a machine showing the main shaftand a portion of the feed mechanism; Fig' 6 1s a top view of the plate and portions of certain operating parts; Fig. 7 is a top view of the plate alone; Fig. 8 is a sectionon the line aa of Fig.

The numeral 1 indicates the base and frame of a single thread blind stitching machine of the form heretofore in use. 'Said base is provided with a rear standard 2 and front standard .3, the said standards being provided with suitable bearings for the operating parts of the machine. The rear standard 2 has a forward projecting arm 4,

reciprocating and rotary motion, the foliward end of said shaft being supported the swinging arm 11. Also mounted on the shaft 6, intermediate the crank 8 and the bearing 5, is an eccentric disk 12 operating.-

the link 13 by means of which the crank 14: is rocked to operate the shaft 15 hearing the needle arm 16. Mounted on the upper part of the arm 4: and on the needle arm are thread guides 17.

Pivotally mounted on the bearing of standard 3 is the apron 18. Said apron is provided with a downward projecting arm 19. The lower end of said arm is secured by a spring 20, the .opposite end of said spring being secured to a fixed arm 21; the spring 20 being under tension, the forward portion .of the apron 18 is normally maintained in an elevated position, the apron and arm 19 operating as a bell crank. The apron 18 has perforated lugs 22 between which is pivotally mounted an arm 23, having bearings 2 1 for the shaft 25, operating the under feed wheels 26. The shaft 25 being connected with said wheels by means of a universal joint 27 and the opposite I v of said wheels upon the material operated briefly, the construction and operation thereof being well understood by. those skilled in'the art, for the purpose of explaining my invention, which consists in the substitution for other old parts of the machine, the parts and construction which I will now describe.

Secured to the apron 18 is an extension provided at its outer end with a bearing 31 for the shaft 25, which, in my new construction, is lerggthened so as to operate in said bearing. ecured to the outer end of the shaft 25, beyond the bearing 31, is a ratchet wheel 32. On the shaft 6 between the bearing 5 and pulley 7 is an eccentric disk 33 for the-operation of an arm 34, said arm being mounted on said disk in the usual manner. Pivotally mounted on a shaft 35 on the standard 3, .are links 36. Loosely mounted between these links, is a bar 37 upon which the free end of the arm" 34 is fixedly secured, so that reciprocation of the arm 34, caused by the eccentric disk 33, may produce a rocking movement of said links and bar. Loosely mounted on the bar 37 is a collar 38 carrying an operating pawl 39 adapted to engage the teeth of the ratchet wheel 32, to operate the under feed shaft 25 intermittently with the rocking of the links 36. A positive bearing of said pawl upon the ratchet wheel 32 is maintained by.

meansof a spring 40, the opposite ends of which are secured in the collar 38 and a collar 41, the collar 41 being secured fixed to the bar 37 by means of a set screw. The arm of the pawl 39 is slidably mounted in a perforation in the collar 38, and suitable longitudinal adjustment thereof may thus be effected, and, when such adjustment is obtained, the pawl may be locked in position by means of a set .screw 42. Rig-idly mounted on a projection of the bar 37, beyond the inner link 36 is an arm 43, upon which the upper feed arm 44 is mounted.

The upper feed arm willthus receive intermittent reciprocating motion concurrent with the under feed wheels as will readily be seen.

' The table, or plate, of my machine is indlcated 1n the drawings by the numeral 45.

Said plate is rigidly secured at the rear to ithe under side of the arin 4 of the main frame, as will'be seen in'Fig. 2 of the drawings. Just back of the operating field thereof, said plate is provided with a yoke 46 adapted to be secured to the arm 4 of the frame. It will thus be seen that said plate is firmly secured against movement during the operation of the machine. Upon one side of said plate is the needle guide 47, said guide consisting of a block permanently secured to the plate. Said block is grooved, as clearly shown in Fig. 7 of the drawings to form a channel for the guidance of the needle during its operation. Said needle guide, being permanently fixed, requires no adjustment, and it is thus at all times in suitable position properly to guide the needle without breakage during the operation of the machine. The plate is .of the .form clearly shown in Fig. 7; that is, it is generally solid but is provided with two openings beneath which the under feed wheels operate, and through one of which the material operated upon is forced by the bridge hereinafter described, to receive the stitching; the upper feed arm also engages the material through one of said openings, co6perating with the. under feed wheels in the intermittent moving of the material during operation. The upper side of said plate is also formed with hollowed out portions 48, to make room for the lower strokes of the looper 50.

Pivotally mounted in an arm 51 on the apron 18 is the bridge 52. The free end of said bridge rests in an arm 53 of said apron, where a set screw 54 is provided to hold the same in position, the bridge passing between the under feed wheels 26, as shown in Fig. 4, and thrusting the goods through one of the openings in the plate to receive the stitching. By loosening the set screw 54 it will be observed that the bridge can he readily raised or lowered at will for purposes of adjustment, and that such adjustments may be effected independently of the adjustment of the feed wheels 26, the latter being effected by the raising or lowering of the apron 18. A thumb screw 55, arranged to operate through the lower portion of the standard 3 and to bear against the arm 19, is provided for the suitable adjustment of the apron, the bearing of the arm 19 on the thumb screw normally maintaining the apron at the desired elevation. A set screw I new'plate, or table, which I have provided for said machine, however, the machine, around the plate, is open and without obstruction, and there is therefore suficient space for the passage of the material durin operation of the machine as it is being fe through the same; and the plate, furthermore, being provided only with smallopenings for the operations of the feed mechanism, needle and bridge, the material is revented' from catching in the plate and c ogging therein. In the machine heretofore in use, moreover,-the adjustment of the needle guide was a source of continual annoyance,

loss of time, and breakage of needles; these evils are remedied, as will be clear to those skilled in the art, by the new needle, guide which I have provided on the plate. The,

advantages accruing from the new adjustable bridge above described will also be aparent to persons skilled in the art. The ridge provided in the single thread blind stitching machines heretofore in use could 'only be adjusted with considerable labor and loss of time, and hence such adjustments were usually efi'ected' by raising or lowering the apron; this method of adjustment, however, threw out of proper adjustment the under feed wheels, and was, therefore, no more than a make shift, which need not be resorted to in my machine be cause of the facility with which proper adjustments of the bridge alone may be portions for-the lower strokes of the. looper of said machine, of a needle guide for said machine, said needle guide comprising a block permanently afiixed to said plate, said block being provided with a groove arranged to serve as a guiding channel for the operation of the needle of said machine.

JACOB GOLDBERG. Witnesses:

FREDK J. WENDELN, ARTHUR H. EWALD. 

